Kenko PL FINDER [R]

You simply mount the PL Finder on the hotshoe of your
camera. Attach the included vernier polarizing filter in front of your lens.
Look through the PL Finder, turn the ring on the PL Finder to achieve the desire
effect. Note the numerical mark on PL Finder where the white dot is. Adjust the
vernier polarizing filter so that the numerical marking on the filter is also
pointing at the same direction (ie: inline with the white dot on the PL Finder).
Then compose the picture using your camera's viewfinder and take the shot.